[VOL-5009] - Update release notes

[VOL-5061]

overview/releases.rst
---------------------
  o Correct start/end release dates for v2.10-v2.12 to reflect reality.

release_notes/voltha_2.12.rst
-----------------------------
  o Populate the onos apps grid with versioned artifact and VCS urls.
  o Component kafka the only holdout

howto/release/checklist.rst
howto/release/components/index.rst
howto/release/index.rst
howto/release/voltha-docs/index.rst
howto/release/voltha-docs/release_notes.rst
howto/release/branching/
howto/release/components/igmpproxy/
howto/release/components/kafka/
howto/release/components/maclearner/
howto/release/components/pppoeagent/
howto/release/voltha-docs/release_history.rst
---------------------------------------------
  o Add more random content and links for release dependencies and tasks.

Change-Id: I31338488a4e626a97435429a36e200d54cf6267e
diff --git a/overview/releases.rst b/overview/releases.rst
index 5970216..5619bb4 100644
--- a/overview/releases.rst
+++ b/overview/releases.rst
@@ -117,17 +117,17 @@
      -
      -
    * - `VOLTHA 2.10 <../release_notes/voltha_2.10.html>`_
-     - June 30, 2022
-     - December 30, 2022
+     - July 1, 2022
+     - Dec 30, 2022
      -
      -
    * - `VOLTHA 2.11 <../release_notes/voltha_2.11.html>`_
-     - June 30, 2022
-     - December 30, 2022
+     - Feb 6, 2023
+     - July 1, 2023
      -
      -
    * - `VOLTHA 2.12 <../release_notes/voltha_2.12.html>`_
-     - December 30, 2022
-     - June 30, 2023
+     - July 1, 2023
+     - Dec 30, 2023
      -
      -